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Speaking again of fully ported, the Pro 1 227 CNC heads also feature a thoroughly worked-over and bowl-blended combustion chamber. Once the machines have had their way with the castings, the chambers each measure 66 cc--not the more commonly seen 64 cc. It makes a difference when calculating compression ratio.
Chevy Small Block Dyno Tests - Old School Meets New

Speaking again of fully ported, the Pro 1 227 CNC heads also feature a thoroughly worked-over and bowl-blended combustion chamber. Once the machines have had their way with the castings, the chambers each measure 66 cc--not the more commonly seen 64 cc. It makes a difference when calculating compression ratio.  View Related Article

 

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